Fix crash when destroying a RenderWidgetHost that holds the pointer

content/browser/renderer_host/render_widget_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 
 #include <set>
 #include <tuple>
@@ skipping 1713 matching lines @@
 
 void RenderWidgetHostImpl::OnLockMouse(bool user_gesture,
                                        bool last_unlocked_by_target,
                                        bool privileged) {
   if (pending_mouse_lock_request_) {
     Send(new ViewMsg_LockMouse_ACK(routing_id_, false));
     return;
   }
 
   pending_mouse_lock_request_ = true;
+  if (delegate_) {
+    delegate_->RequestToLockMouse(this, user_gesture, last_unlocked_by_target,
+                                  privileged && allow_privileged_mouse_lock_);
+    return;
+  }
+
   if (privileged && allow_privileged_mouse_lock_) {
     // Directly approve to lock the mouse.
     GotResponseToLockMouseRequest(true);
   } else {
-    if (delegate_) {
-      delegate_->RequestToLockMouse(this, user_gesture,
-                                    last_unlocked_by_target);
-      return;
-    }
-    // If there's no delegate, just reject it.
+    // Otherwise, just reject it.
     GotResponseToLockMouseRequest(false);
   }
 }
 
 void RenderWidgetHostImpl::OnUnlockMouse() {
   RejectMouseLockOrUnlockIfNecessary();
 }
 
 void RenderWidgetHostImpl::OnShowDisambiguationPopup(
     const gfx::Rect& rect_pixels,
@@ skipping 398 matching lines @@
   return delegate_ ? delegate_->GetRootBrowserAccessibilityManager() : NULL;
 }
 
 BrowserAccessibilityManager*
     RenderWidgetHostImpl::GetOrCreateRootBrowserAccessibilityManager() {
   return delegate_ ?
       delegate_->GetOrCreateRootBrowserAccessibilityManager() : NULL;
 }
 
 }  // namespace content